Question

[trần trang]

Tìm tất cả các tập hợp con của tập hợp:

a) A = \(\left\{a,b\right\}\)

b) B = \(\left\{1,2,3\right\}\)

c) C = \(\left\{x\in N/x\le3\right\}\)

d) D = \(\left\{x\in Z/\left(x-1\right)\left(2x^2+5x+2\right)=0\right\}\)

Answer 1

[Hoàng Tử Hà]

a/ \(\left\{a\right\};\left\{b\right\};\left\{a;b\right\};\varnothing\)

b/ \(\left\{1\right\};\left\{2\right\};\left\{3\right\};\left\{1;2\right\};\left\{1;3\right\};\left\{2;3\right\};\left\{1;2;3\right\};\varnothing\)

c/ \(\left\{0\right\};\left\{1\right\};\left\{2\right\};\left\{3\right\};\left\{0;1\right\};\left\{0;2\right\};\left\{0;3\right\};\left\{1;2\right\};\left\{1;3\right\};\left\{2;3\right\};\left\{0;1;2\right\};\left\{1;2;3\right\};\left\{0;2;3\right\};\left\{0;1;3\right\};\left\{0;1;2;3\right\};\varnothing\)

d/ \(\left\{1\right\};\left\{-2\right\};\left\{1;-2\right\};\varnothing\)